Global Patent Index - EP 1103951 A3

EP 1103951 A3 20010926 - Adaptive wavelet extraction for speech recognition

Title (en)

Adaptive wavelet extraction for speech recognition

Title (de)

Adaptive Wavelet-Extraktion für die Spracherkennung

Title (fr)

Extraction adaptée d'ondelettes pour la reconnaissance de la parole

Publication

EP 1103951 A3 20010926 (EN)

Application

EP 00310385 A 20001122

Priority

US 44905399 A 19991124

Abstract (en)

[origin: EP1103951A2] The acoustic speech signal is decomposed into wavelets arranged in an asymmetrical tree data structure from which individual nodes may be selected to best extract local features, as needed to model specific classes of sound units. The wavelet packet transformation is smoothed through integration and compressed to apply a non-linearity prior to discrete cosine transformation. The resulting subband features such as cepstral coefficients may then be used to construct the speech recognizer's speech models. Using the local feature information extracted in this manner allows a single recognizer to be optimized for several different classes of sound units, thereby eliminating the need for parallel path recognizers. <IMAGE>

IPC 1-7

G10L 15/02

IPC 8 full level

G10L 15/02 (2006.01); G10L 17/00 (2013.01); G10L 25/00 (2013.01); G10L 25/15 (2013.01); G10L 25/18 (2013.01)

CPC (source: EP US)

G10L 15/02 (2013.01 - EP US); G10L 25/27 (2013.01 - EP US)

Citation (search report)

  • [PX] KRYZE ET AL.: "A new noise-robust subband front-end and its comparison to plp", ASRU'99, 12 December 1999 (1999-12-12) - 15 December 1999 (1999-12-15), Keystone, Colorado, XP002173580
  • [X] LONG ET AL.: "Discriminant Wavelet Basis Construction for Speech Recognition", ICSLP'98, 30 November 1998 (1998-11-30) - 4 December 1998 (1998-12-04), Sydney, Australia, pages 1047 - 1049, XP002173581
  • [X] CHANG SUNGWOOK ET AL: "Speech feature extracted from adaptive wavelet for speech recognition", ELECTRONICS LETTERS,IEE STEVENAGE,GB, vol. 34, no. 23, 12 November 1998 (1998-11-12), pages 2211 - 2213, XP006010556, ISSN: 0013-5194
  • [X] LONG C J ET AL: "Wavelet based feature extraction for phoneme recognition", PROCEEDINGS ICSLP 96. FOURTH INTERNATIONAL CONFERENCE ON SPOKEN LANGUAGE PROCESSING (CAT. NO.96TH8206), PHILADELPHIA, PA, USA, 3-6 OCT. 1996, 1996, New York, NY, USA, IEEE, USA, pages 264 - 267 vol.1, XP002173582, ISBN: 0-7803-3555-4
  • [X] TAN B T ET AL: "The use of wavelet transforms in phoneme recognition", PROCEEDINGS ICSLP 96. FOURTH INTERNATIONAL CONFERENCE ON SPOKEN LANGUAGE PROCESSING (CAT. NO.96TH8206), PHILADELPHIA, PA, USA, 3-6 OCT. 1996, 1996, New York, NY, USA, IEEE, USA, pages 2431 - 2434 vol.4, XP002173583, ISBN: 0-7803-3555-4
  • [A] ERZIN E ET AL: "Subband decomposition based speech recognition in the presence of car noise", TURKISH JOURNAL ELECTRICAL ENGINEERING AND COMPUTER SCIENCES, ELEKTRIK, 1997, SCI. & TECH. RES. COUNCIL TURKEY, TURKEY, vol. 5, no. 3, pages 297 - 305, XP001015312, ISSN: 1300-0632

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

DOCDB simple family (publication)

EP 1103951 A2 20010530; EP 1103951 A3 20010926; EP 1103951 B1 20050323; CN 1152367 C 20040602; CN 1299127 A 20010613; DE 60018886 D1 20050428; DE 60018886 T2 20060209; ES 2240019 T3 20051016; JP 2001184083 A 20010706; JP 3654831 B2 20050602; TW 546630 B 20030811; US 6513004 B1 20030128

DOCDB simple family (application)

EP 00310385 A 20001122; CN 00128331 A 20001124; DE 60018886 T 20001122; ES 00310385 T 20001122; JP 2000357217 A 20001124; TW 89124931 A 20010201; US 44905399 A 19991124